The Steenrod Algebra and Theories Associated to Hopf Algebras. - Hans-Joachim Baues; Mamuka Jibladze (Appl. Categorical Struct., 2004)

Smash Products for Secondary Homotopy Groups. - Hans-Joachim Baues; Fernando Muro (Appl. Categorical Struct., 2008)

Intersection of Subgroups in Free Groups and Homotopy Groups. - Hans-Joachim Baues; Roman Mikhailov (Int. J. Algebra Comput., 2008)

The third homotopy group as a π1-module. - Hans-Joachim Baues; Beatrice Bleile (Appl. Algebra Eng. Commun. Comput., 2015)

The DG-Category of Secondary Cohomology Operations. - Hans-Joachim Baues; Martin Frankland (Appl. Categorical Struct., 2020)